Pipe-wrench.



No; 735,289. PATENTBD AUG. 4,1903.

K. PETERSON. PIPE WRENCH.

. APPLICATION I'ILBD OUT. 0, 1902. NOIMODEL.

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29 79 49 zz 5 J 2 4 ll Z W I 17 3 50 -26 48 I i 20 12/015 19 1. 11

ATTORNEY UNITED "STATEs Patented August 4, 1903.

KARL PETERSON, OF JAMESTOWN, YORK, ASSIGNOR TO WILLIAM HJORTH AND COMPANY, OF JAMESTOWN, NEW YORK.

PIPE-WRENCH.

SPECIFICATION forming part of Letters Patent No. 735,289, dated August 4, 190,3.-

. Application filed October 9 1962. SerZial'No 126,397. "(to model.)

To all whorrtit may concerns Be it known thaflI,"KARL PETERSON, acitizen of the United States, and a' resident of Jamestown, in the county of Chautauqua and State of New York, have invented a new and useful Pipe-Wreneh,of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

My invention relates to improvements in pipe-wrenches in which loose jaws are locked by spring-toothed dogs; andthe obj ectsof m invention are,.first,to provide a thumb'strap or yoke for operating said spring-dog, so that the wrench can be easily adjusted to the pipe with one hand, and, second, to providea seat" for said dog whereby its separation from looking conjunction with the movable jaw is assured.

In the drawings, Figure 1 is aside elevation of my complete wrench.- Fig.2 is a side elevation of wrench with side plate removed and spring-dog depressed. Fig. 3 is a sectional view at lineX X in Fig. 1. Fig. 4 is a detail of depressing strap or yoke for the'spring-dog. Fig. 5 is a side elevation of hood, showing opening and slot for yoke.

Similar numerals refer to corresponding parts.

Numeral 10 is the stock of the wrench,which has a suitable handle 11 thereonand a fixed jaw 12 on the end 13. A hood 14 extends down on each side of end 13 and is attached thereto by rivets 15, which extend through stock 10 and the two sides of hood 14, as shown in dotted outline in Fig. 3. Stock 10 and hood 14 might be cast in one piece and not depart from my invention. Fixed jaw 12 is formed by making the angular cut 16 in end 13 of the stock and the two sides of hood 14 after the hood is attached to the stock. A

toothed plate 1?, having one side serrated to grip the pipe andthe other side formed tofit cut 16, is attached to end 13'bya countersunk screw 18. (Shownin dottedoutline.)

It is apparent that byattaching hood 14 to stock 10, as stated, an opening is formed to shank 19.

A pin 22 gives a like bearing-point under side of shank 19 has teeth 24 cut therein.

A dog 25,having usually about-a dozen, teeth to fit in teeth 24, is held up to its normal position by aspring 26, which is attached to stock 10. Hood 14 has a slot 27 and an opening 28 in each side, as shown in Figs. 3 and 5.

.A yoke-piece 29 is usually made of strap metal in the form shown in Fig. 4 and of correct size to work in slots 27 and openings 28. The lower ends extend intoopeuings 28 and are pivotally attached to dog 25 v by rivet 30, usually a little forward of the center of the balance of said dog, as shown in Fig. 3. The openings 28 are made suficiently large to allow ofthe depression of yoke 29, which yoke extends sufficiently above hood 14 to allow of said depression. It will be seen thatyoke 29 andspring 26 hold dog 25 firmly in position. In order to prevent either end of dog 25 from'fiying up and engaging teeth' 24 when ,the dog is depressed and to insure the entire separation of dog 25 and shank 19 during suchQdepression, the upper side of stock 10 within the hood 14 is cut at right angles from bearing-point 21, so that the inner end of dog v25 can drop straight down when depressed.

A broad seat or stop 31 is provided atafiixed distance from shank 19 for said inner end that it may be held against it, and thus regulate the distance at which thetwo parts are separated. It is obvious that since pin 30 is placed forward of the center of balance on dog 25 and to the rear of stop 31 then when dog 25 is depressed said inner end is depressed first and positively to said stop, and thenif the pressure is continued the rear end of the 1 dog must also be forced down, thus bringing the entire dog under complete control.

It is apparent that the action of my pipewrench is simple and efiective. The wrench A pin or.

for the opposite side of said shank. More is grasped in one hand with the fingers around the stock and the thumb on yoke 29. A di rect pressure of the thumb depresses dog from its locking conjunction with shank 19 of movable jaw 20, where spring 26 normally holds it, as shown in Fig. 1, to the position shown in Fig. 2. It is now apparent that movable jaw 20 is entirely free to slide back and forth in hood 14, and it is only necessary to turnthe wrench up or down to form contact or separation between jaws 12 and 20. As soon as jaw 20 is adjusted to the desired position yoke 29 is released, allowing dog 25 to assume its normal position in lockingconjunction with teeth 24 on shank 19, andsince there are about a dozen teeth on dog 25 in said locking conjunction the great strength of my wrench is at once apparent. To adjust a'wrench on a pipe, the yoke is depressed with the loose jaw turned downward, allowing it to fall of its own weight until stopped by detent 23. The jaws of wrench are then placed over the pipe and the loose jaw falls or is pushed into conjunction with the pipe, after which the dog is released. This can be easily done with one hand while the other hand is engaged in holding the ends of the I claim as new- 1. In a pipe-wrench having a fixed jaw, a movable jaw having a toothed shank slidably mounted on said fixed jaw, a toothed dog for engaging said toothed shank, and a yoke attached to said dog to operate the same.

2. A pipe-wrench comprising a stock 10 having projection 21 thereon, a fixed jaw 12 on said stock, a hood 14 on said stock and having a pin 22 therein, a movable jaw 20 having 7 

